The parallel plate capacitor has potential difference of $100\mathrm{ }\mathrm{V}$ and separation between the plate is $1\mathrm{ }\mathrm{m}\mathrm{m}$ . An electron is projected along $\mathrm{x}$ axis in between the plates. If the electron comes out of the plates along the $\mathrm{x}$ axis undeviated then the magnitude and direction of magnetic field that must be applied between the plates : (particle is projected with a velocity of ${10}^5\mathrm{m}/\mathrm{s}$ along $\mathrm{x}$ axis)